参与竞争的两种无人机均为单一扇涡轮驱动的无尾翼飞行飞机，除此以外，X - 47 B被设计用于航母作战，具有可折叠机翼，并装备有尾部吊钩。

While both competitors are tailless flying wings powered by single turbofans, the X-47B was designed for carrier operations and features folding wings and a tail hook.

youdao

霸王龙的尾部是独一无二的。

But T. rex's tail was unique.

youdao

显示他的遗传素质本能冲动当他漂浮头朝下在唱歌位置，坦白的展示这独一无二的榜样通过在尾部的标志，个体的驼背鲸是能够识别的。

Showing his id as he floats head-down in the singing position, Frank displays the unique pattern of tail markings by which individual humpback whales can be recognized.

youdao